Judge Bolton blocked a section of the law that requires police to check the immigration status of people stopped for other crimes--one of the provisions most contested by opponents of the measure, according to The AP.

Bolton's ruling also bars the state from requiring immigrants to have their papers with them; but, as TheAP reports, this is only a temporary hold until courts rule on whether the provision can go into effect at a later date.

The AP reports that dozens of protestors were arrested in Phoenix on Thursday.